Mailbox post



FIG. 1 is a front, top, left perspective view of a mailbox post, showing my new design;

FIG. 2 is a front elevation view thereof, the rear elevation view, the left side elevation view, and the right side elevation view being a mirror image thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

CLAIM The ornamental design for a mailbox post, as shown and described. 